Rafael Nadal was seeded No. 1 for the U.S. Open

Rafael Nadal was seeded No. 1 for the U.S. Open on Tuesday, making it the first time since January 2004 that a man other than Switzerland's Roger Federer held that top spot at a Grand Slam tournament.

Ana Ivanovic is the No. 1 seed on the women's side. The tournament begins Monday. The draw will be announced Thursday.

Amelie Mauresmo dominated at times and struggled at others Tuesday in a 6-2, 6-7 (3), 6-2 victory over Kaia Kanepi of Estonia in the first round of the Pilot Pen Tennis Tournament. Mauresmo, a two-time Grand Slam singles champion from France, rolled through the first set but had trouble with her serve in dropping the second.

She took control again in the deciding set, though she finished with 12 double faults after recording six in the second set.

The other two women's matches early in the day saw qualifier Monica Niculescus defeat Maria Kirilenko, 6-7 (7), 6-2, 6-1 and Flavia Pennetta beat Gisela Dulko, 6-3, 6-1.

In the men's draw, American Robby Ginepri defeated Agustin Calleri, 6-2, 4-6, 6-2.

Crowd favorite Lindsay Davenport and Daniela Hantuchova won their first Pilot Pen doubles match Tuesday, defeating Olga Govortsova and Jill Craybas, 6-3, 6-4, in front of about 1,500 on the Grandstand court Tuesday afternoon.

Fourth-seeded Agnes Szavay of Hungry defeated Sara Errani of Italy 6-4, 6-7 (3), 6-4.

Third-seeded Marion Bartoli of France avoided an upset by rallying to beat Tsvetana Pironkova of Bulgaria 2-6, 6-4, 7-5 in the second round.